C output type question

Q.  C Programming : Consider the following program

int n(int i)
{
     static int a=0;
     if(i<=0) return 1;
     if (i>3)
     {
          a=i;
return n(i-2)+2;
                }
               return n (i-1)+a;
           }
             What is the value of f(5)?
- Published on 16 Jun 15

a. 5
b. 10
c. 12
d. 18

ANSWER: 18

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